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標題: Preparation of a palladium dimer with a cobalt-containing bulky phosphine ligand: Its application in palladium catalyzed Suzuki reactions
作者: Gan, Y.H.
Lee, H.C.
Hong, F.E.
關鍵字: palladium dimer;Suzuki reaction;transition-metal containing phosphine;ligand;orthometallation;cross-coupling reactions;transition-metal;organic-synthesis;aryl;chlorides;bond formation;donor ligands;complexes;amination;bromides;convenient
Project: Polyhedron
期刊/報告no:: Polyhedron, Volume 25, Issue 18, Page(s) 3555-3561.
A palladium dimer with a cobalt-containing phosphine ligand, {(mu-PPh2CH2PPh2)CO2(CO)(4)(mu,eta-(tBu)(2)PC CC6H4-kappa C-1)Pd(mu-Cl)}(2) (3), was prepared from the reaction of its monomer precursor, (mu-PPh2CH2PPh2)Co-2(CO)(4)(mu,eta-(tBu)(2)PC CC6H4-kappa C-1)Pd(mu-OAc) (2), with LiCl. The crystal structure of 3, determined by X-ray diffraction methods, revealed a doubly chloride-bridged palladium dimeric conformation. Suzuki coupling reactions of bromobenzene with phenylboronic acid were carried out catalytically using these two novel palladium complexes 2 and 3 as catalyst precursors. Factors such as the molar ratio of substrate/catalyst, reaction temperature, base and solvent that might affect the catalytic efficiencies were investigated. As a general rule, the performance is much better by employing 3 than 2 as the catalyst precursor. (c) 2006 Elsevier Ltd. All rights reserved.
ISSN: 0277-5387
DOI: 10.1016/j.poly.2006.07.005
Appears in Collections:化學系所

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